EP3543643A1 - Unit for detecting deformations and rotor blade with such a unit - Google Patents
Unit for detecting deformations and rotor blade with such a unit Download PDFInfo
- Publication number
- EP3543643A1 EP3543643A1 EP19152693.8A EP19152693A EP3543643A1 EP 3543643 A1 EP3543643 A1 EP 3543643A1 EP 19152693 A EP19152693 A EP 19152693A EP 3543643 A1 EP3543643 A1 EP 3543643A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring device
- rod
- rotor blade
- compensating coupling
- component group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 230000007613 environmental effect Effects 0.000 description 2
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Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B1/00—Measuring instruments characterised by the selection of material therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0016—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of aircraft wings or blades
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/83—Testing, e.g. methods, components or tools therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/328—Blade pitch angle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
- F05B2270/804—Optical devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
- F05B2270/821—Displacement measuring means, e.g. inductive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/3473—Circular or rotary encoders
- G01D5/34738—Axles; Driving or coupling means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Definitions
- the invention relates to an assembly for detecting deformations of a component, such as a rotor blade of a wind turbine, according to claim 1 and a rotor blade according to claim 8.
- Rotor blades of wind turbines are exposed to a variety of forces that naturally lead to deformations, in particular torsional deformations of the rotor blades. In any event, the extent of wind turbine blade deformations is difficult to predict, and efforts are therefore made to capture these as actual values.
- a rotor blade often has an inner support structure, which serves for mechanical reinforcement of the outer skin of the rotor blade, so that the support structure is deformed together with the outer skin in particular under torsional stress.
- the invention has for its object to provide a structural unit for detecting deformations of a component, such as a rotor blade of a wind turbine, which is relatively simple and works precisely.
- the assembly comprises a support structure and a measuring device.
- the measuring device has a first compensating coupling, a rod and an angle measuring device.
- the first compensating coupling is torsionally rigid and the rod has a longitudinal axis.
- the angle measuring device comprises a first component group and a second component group, wherein the first component group is arranged rotatable relative to the second component group about the longitudinal axis.
- the angle measuring device is designed such that a relative angular position of the two component groups is measurable to each other by this.
- the first compensating coupling is connected directly or indirectly with the support structure rotatably.
- the rod is connected directly or indirectly non-rotatably connected to the first compensating coupling.
- first group of components rotatably connected to the rod and the second component group rotatably connected to the support structure, so that by measuring the relative angular position of the two component groups to one another about the longitudinal axis caused by mechanical stress torsion or torsional deformation of the support structure can be determined.
- the rod is made of a material comprising plastic, in particular, the plastic may be fiber-reinforced.
- the second component group of the angle measuring device has a second compensating coupling, wherein the second compensating coupling is non-rotatably connected to the carrier structure.
- the angle measuring device has a material measure and an element for scanning the measuring graduation.
- the material measure can be designed annular and is then geometrically considered a hollow cylinder with circumferential sides of the shell.
- the shell sides may have a small height, so that the material measure is designed as an annular disc with annular parallel aligned end faces, which may also be referred to as the base or top surfaces.
- the angle scaling or angle coding can be applied to one of the end faces.
- the angle scaling can be applied to the shell side.
- the measuring standard can also be configured as a measuring tape, which is attached, for example, on the shell side of a cylindrical body on the outside or on the inside thereof.
- the material measure may be designed such that it has a scaling only over a limited angular range, ie does not extend over 360 °, but only has an angular segment as a measuring range.
- the angular extent of the material measure can be matched to the maximum measuring range or swivel angle.
- the element for scanning the material measure is designed to be photosensitive or photosensitive. Accordingly, such a sampling is based on an optical principle.
- the sampling may be based on an inductive or magnetic principle.
- the angle measuring device can, in particular, provide digital position signals and / or signals which have been generated by single or multiple differentiation of the position signals with respect to time.
- the transmission of the relevant signals can be purely digital and serial, so that a comparatively simple processing of the signals is possible, for. B. for integration into a highly dynamic control.
- the angle measuring device advantageously has a material measure with an absolute coding, so that the relative angular position between the first and the second component group can be measured as an absolute value by the angle measuring device (in contrast to an incremental measurement). In this way, the absolute deformation of the rotor blade can be measured at arbitrary times. This is particularly advantageous for checking settling processes in the structure of the rotor blade.
- the structural unit has a plurality of measuring devices, which are arranged offset from one another, in particular along the longitudinal axis, or are lined up along the longitudinal axis.
- Another aspect of the invention relates to a rotor blade of a wind turbine with the measuring device for detecting deformations.
- the rod is mounted in the rotor blade so that it is oriented in the longitudinal direction of the rotor blade.
- the rod has the same thermal expansion coefficient as the rotor blade.
- FIG. 1 is a rotor blade 3 of a wind turbine shown, which is part of a wind turbine with horizontal axis in the illustrated embodiment, which has a total of three rotor blades 3 in particular.
- the rotor blade 3 has a support structure 1, which is mounted for mechanical stabilization within the rotor blade 3 and serves to stiffen the rotor blade 3.
- the support structure 1 has a bulkhead 1.3, which is a boundary wall to the hub of the wind turbine.
- a measuring device 2 for detecting deformations of the rotor blade 3 is mounted in the carrier structure 1, corresponding to the view according to FIG. 2, where a wall of the carrier structure 1 is not completely shown in the illustration for better illustration.
- the support structure 1 has a first flange 1.1 and a second flange 1.2.
- the measuring device 2 comprises a first compensating coupling 2.1, a bar 2.2 with a longitudinal axis A and an angle measuring device 2.3, which can also be referred to as a rotary encoder.
- the first compensating coupling 2.1 is configured as a metal bellows coupling. Alternatively, a diaphragm coupling can also be used here, for example. In any case, the first compensating coupling 2.1 compensates for axial movements and misalignment (radial and angular misalignment) between the bar 2.2 and the carrier structure 1, but is torsionally rigid.
- the first compensating coupling 2.1 can be rigidly secured to the first flange 1.1 of the support structure 1.
- the rod 2.2 is like the rotor blade 3 made of glass fiber reinforced plastic and has the longitudinal axis A, which is oriented in the direction x parallel to the longitudinal axis of the rotor blade 3.
- the bar 2.2 also has a first connection point, which is rotatably connected to the first compensating coupling 2.1.
- the angle measuring device 2.3 is connected to the second flange 1.2 with the support structure 1.
- the illustrated angle measuring device 2.3 comprises according to the FIG. 3 a first component group 2.31 and a second component group 2.32.
- the first component group 2.31 has a shaft 2.311, which is designed in the presented embodiment as a continuous hollow shaft, so that in this the rod 2.2 can be added.
- the shaft 2.311 further has a shoulder on which a material measure 2.314, z. B. by gluing, fixed and only with small tolerance deviations is centered with respect to the longitudinal axis A.
- the material measure 2.314 consists in the illustrated embodiment of glass and is designed annular. It naturally has two end surfaces, wherein on one of the end faces an angle scaling is applied.
- the angle scaling can be configured, for example, as an incremental graduation with radially oriented graduated lines, but additionally or alternatively, an absolute code can also be provided.
- a clamping element 2.312 is provided, with the aid of which the rod 2.2 is connected to prevent jamming with shaft 2.311, so that during a rotational movement of the rod 2.2, a pivotal movement of the shaft 2.311 can be generated.
- the clamping element 2.312 can be assigned to the first component group 2.31.
- the rod 2.2 is therefore connected at its second connection point with the angle measuring device 2.3, in particular with the first component group 2.31 or the shaft 2.311 of the angle measuring device 2.3.
- the shaft 2.311 is in accordance with FIG. 3 within a body 2.323, which is assigned to the second component group 2.32, rotatably supported by two bearings 2.33.
- a light source 2.322 which comprises, for example, an LED and a collimator lens, so that 2.322 collimated light is emitted by the light source.
- This light passes through the material measure 2.314 or its angle scaling and is modulated according to the angular position between the first component group 2.31 and the second component group 2.32 or the shaft 2.311 and the body 2.323.
- the modulated light is scanned by a scanner 2.324 attached to the body 2.323.
- Corresponding photosensitive or photosensitive detectors are located on the scanning device 2.324 designed as a populated printed circuit board.
- the scanning device 2.324 also includes electronic components for signal shaping - for example, for amplification and digitization - of the scanning signals supplied by the detectors.
- a housing 2.321 is mounted so that, among other things, the light source 2.322, the measuring scale 2.314 and the scanning device 2.324 are protected against environmental influences.
- a second compensating coupling 2.325 is attached on the body 2.323 .
- the second compensating coupling 2.325 is made of a sheet metal and in particular produced as a one-piece stamped and bent part. This second compensating coupling 2.325 is used for non-rotatable attachment the second angle 2.3.2 compensates axial movements and misalignment (radial and angular misalignment) between the angle measuring device 2.3 and the support structure 1 and is torsionally rigid.
- angle measuring device 2.3 By means of the angle measuring device 2.3, the relative angular position between the first component group 2.31 and the second component group 2.32 or between the shaft 2.311 and the rod 2.2 can thus be determined.
- angle measuring devices 2.3 are also often referred to as rotary encoders.
- the rotor blades 3 are deformed by their own weight and by aerodynamic loads.
- impressed loads can lead to torsional movements of the rotor blade 3 about the longitudinal axis A.
- the support structure 1 is deformed, with the result that the rod 2.2 is rotated relative to the second flange 1.2.
- This rotation by a comparatively small angular amount (in the exemplary embodiment presented, the maximum rotation is about 120 angular minutes) is detected by the angle measuring device 2.3 and corresponding signals are emitted.
- the first component group 2.31 performs relative to the second component group 2.32 rotation or pivoting movements only in a small angular range.
- the measuring device 2 for detecting deformations of the rotor blade 3 can also be designed with a rod 2.2, which is guided through a plurality of angle measuring device 2.3 or waves 2.311. Also in this variant, the use of one or more first compensating couplings 2.1 is provided. By the juxtaposed in the direction of the longitudinal axis A angle measuring 2.3, the rotation or torsion of the rotor blade 3 can be determined for several sections.
- the measuring device 2 for detecting deformations of the rotor blade 3 is naturally exposed to large temperature fluctuations in a wind turbine. Nevertheless, extremely high measurement accuracies can be achieved even under these adverse environmental conditions by the above-described measuring device 2 for detecting deformations. This is partly due to the fact that the thermal expansion of material measure 2.314 hardly plays a role through the detection of angular positions (the distances between the scaling lines and their width vary with the temperature, but not the angular position). On the other hand, the rod 2.2 and the rotor blade 3 are made of the same material, so that both have the same thermal expansion behavior. Finally, by the pot-shaped electrically conductive housing 2.321 optimal protection, especially for the scanner 2.324 and associated electronics, against overvoltages z. B. be guaranteed during thunderstorms.
- the signals which can be emitted by the angle measuring device 2.3 are advantageously fully digital, so that the above-mentioned sequential electronics can process the signals of all measuring devices 2 for detecting deformations of the rotor blades without further digitization. On the one hand, this ensures a signal transmission which is secure against external disturbances, on the other hand, the signals can be processed comparatively easily, so that the measured deformations can be processed in a closed-loop control circuit, z. B., for (separate) control of the pitch angle for each rotor blade 3 can be used.
Abstract
Die Erfindung betrifft eine Baueinheit, die eine Trägerstruktur (1) und eine Messvorrichtung (2) umfasst. Die Messvorrichtung (2) weist eine erste Ausgleichskupplung (2.1), einen Stab (2.2) und eine Winkelmesseinrichtung (2.3) auf. Die erste Ausgleichskupplung (2.1) ist drehsteif ausgebildet, der Stab (2.2) weist eine Längsachse (A) auf. Die Winkelmesseinrichtung (2.3) umfasst eine erste Bauteilgruppe (2.31) und eine zweite Bauteilgruppe (2.32), wobei die erste Bauteilgruppe (2.31) relativ zur zweiten Bauteilgruppe (2.32) um die Längsachse (A) drehbar angeordnet ist. Die Winkelmesseinrichtung (2.3) ist so ausgestaltet, dass durch diese eine relative Winkellage der beiden Bauteilgruppen (2.31, 2.32) zueinander messbar ist, wobei die erste Ausgleichskupplung (2.1) drehfest mit der Trägerstruktur (1) verbunden ist, der Stab (2.2) drehfest mit der erste Ausgleichskupplung (2.1) verbunden ist, die erste Bauteilgruppe (2.31) drehfest mit dem Stab (2.2) verbunden ist und die zweite Bauteilgruppe (2.32) drehfest mit der Trägerstruktur (1) verbunden ist. Auf diese Art ist eine um die Längsachse (A) durch mechanische Belastung hervorgerufene Torsion der Trägerstruktur (1) bestimmbar durch Messung der relativen Winkellage der beiden Bauteilgruppen (2.31, 2.32) zueinander.The invention relates to an assembly comprising a support structure (1) and a measuring device (2). The measuring device (2) has a first compensating coupling (2.1), a rod (2.2) and an angle measuring device (2.3). The first compensating coupling (2.1) is torsionally rigid, the rod (2.2) has a longitudinal axis (A). The angle measuring device (2.3) comprises a first component group (2.31) and a second component group (2.32), wherein the first component group (2.31) relative to the second component group (2.32) is arranged rotatably about the longitudinal axis (A). The angle measuring device (2.3) is designed so that by this a relative angular position of the two component groups (2.31, 2.32) is measured to each other, wherein the first compensating coupling (2.1) rotatably connected to the support structure (1), the rod (2.2) rotatably is connected to the first compensating coupling (2.1), the first group of components (2.31) rotatably connected to the rod (2.2) and the second group of components (2.32) rotatably connected to the support structure (1). In this way, a torsion of the support structure (1) caused by mechanical load about the longitudinal axis (A) can be determined by measuring the relative angular position of the two component groups (2.31, 2.32) relative to one another.
Description
Baueinheit zur Erfassung von Verformungen und Rotorblatt mit einer derartigen BaueinheitAssembly for detecting deformations and rotor blade with such a structural unit
Die Erfindung betrifft eine Baueinheit zur Erfassung von Verformungen eines Bauteils, etwa einem Rotorblatt einer Windkraftanlage, gemäß dem Patentanspruch 1 sowie ein Rotorblatt gemäß dem Anspruch 8.The invention relates to an assembly for detecting deformations of a component, such as a rotor blade of a wind turbine, according to
Rotorblätter von Windkraftanlagen sind verschiedensten Kräften ausgesetzt, die naturgemäß zu Verformungen, insbesondere Torsionsverformungen, der Rotorblätter führen. Das Ausmaß der Verformungen von Rotorblättern einer Windenergieanlage ist jedenfalls nur schwer voraussagbar, weshalb Anstrengungen unternommen werden, diese als Ist-Werte zu erfassen.Rotor blades of wind turbines are exposed to a variety of forces that naturally lead to deformations, in particular torsional deformations of the rotor blades. In any event, the extent of wind turbine blade deformations is difficult to predict, and efforts are therefore made to capture these as actual values.
Im Hinblick auf die Vorhersage von Ermüdungsschäden kann es vorteilhaft sein auf Basis der gemessenen Verformungen beziehungsweise Belastungen eine Information rückschauend über eine akkumulierte Belastung des Rotorblatts zu einem gewünschten Zeitpunkt zu erzeugen. Die Verfügbarkeit von derartigen Belastungswerten ist also im Hinblick auf kurzzeitige maximale Belastungen oder zu erwartende Ermüdungsschäden von Bedeutung. Außerdem kann in Kenntnis der Ist-Verformungen beziehungsweise Ist-Lasten die Regelung der Windkraftanlage optimiert werden, beispielsweise durch Verstellung der Pitch-Winkel.With regard to the prediction of fatigue damage, it may be advantageous, based on the measured deformations or loads, to generate information in retrospect on an accumulated load of the rotor blade at a desired point in time. The availability of such load values is therefore of importance with regard to short-term maximum loads or expected fatigue damage. In addition, in knowledge of the actual deformations or actual loads the Control of the wind turbine can be optimized, for example by adjusting the pitch angle.
Ein Rotorblatt weist häufig eine innere Trägerstruktur auf, die zur mechanischen Verstärkung der Außenhaut des Rotorblattes dient, so dass die Trägerstruktur zusammen mit der Außenhaut insbesondere unter Torsionsbeanspruchung verformt wird.A rotor blade often has an inner support structure, which serves for mechanical reinforcement of the outer skin of the rotor blade, so that the support structure is deformed together with the outer skin in particular under torsional stress.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, eine Baueinheit zur Erfassung von Verformungen eines Bauteils, etwa einem Rotorblatt einer Windkraftanlage, zu schaffen, welche vergleichsweise einfach ist und präzise arbeitet.The invention has for its object to provide a structural unit for detecting deformations of a component, such as a rotor blade of a wind turbine, which is relatively simple and works precisely.
Diese Aufgabe wird erfindungsgemäß durch die Baueinheit mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by the unit with the features of
Demnach umfasst die Baueinheit eine Trägerstruktur und eine Messvorrichtung. Die Messvorrichtung weist eine erste Ausgleichskupplung, einen Stab und eine Winkelmesseinrichtung auf. Die erste Ausgleichskupplung ist drehsteif ausgebildet und der Stab weist eine Längsachse auf. Die Winkelmesseinrichtung umfasst eine erste Bauteilgruppe und eine zweite Bauteilgruppe, wobei die erste Bauteilgruppe relativ zur zweiten Bauteilgruppe um die Längsachse drehbar angeordnet ist. Die Winkelmesseinrichtung ist so ausgestaltet, dass durch diese eine relative Winkellage der beiden Bauteilgruppen zueinander messbar ist. Dabei ist die erste Ausgleichskupplung unmittelbar oder mittelbar mit der Trägerstruktur drehfest verbunden. Ferner ist der Stab unmittelbar oder mittelbar drehfest mit der ersten Ausgleichskupplung verbunden. Weiterhin ist die erste Bauteilgruppe drehfest mit dem Stab verbunden und die zweite Bauteilgruppe drehfest mit der Trägerstruktur verbunden, so dass durch Messung der relativen Winkellage der beiden Bauteilgruppen zueinander eine um die Längsachse durch mechanische Belastung hervorgerufene Torsion beziehungsweise Torsionsverformung der Trägerstruktur bestimmbar ist.Accordingly, the assembly comprises a support structure and a measuring device. The measuring device has a first compensating coupling, a rod and an angle measuring device. The first compensating coupling is torsionally rigid and the rod has a longitudinal axis. The angle measuring device comprises a first component group and a second component group, wherein the first component group is arranged rotatable relative to the second component group about the longitudinal axis. The angle measuring device is designed such that a relative angular position of the two component groups is measurable to each other by this. Here, the first compensating coupling is connected directly or indirectly with the support structure rotatably. Furthermore, the rod is connected directly or indirectly non-rotatably connected to the first compensating coupling. Furthermore, the first group of components rotatably connected to the rod and the second component group rotatably connected to the support structure, so that by measuring the relative angular position of the two component groups to one another about the longitudinal axis caused by mechanical stress torsion or torsional deformation of the support structure can be determined.
In weiterer Ausgestaltung der Erfindung ist der Stab aus einem Material hergestellt, welches Kunststoff umfasst, insbesondere kann der Kunststoff faserverstärkt sein.In a further embodiment of the invention, the rod is made of a material comprising plastic, in particular, the plastic may be fiber-reinforced.
Mit Vorteil weist die zweite Bauteilgruppe der Winkelmesseinrichtung eine zweite Ausgleichskupplung auf, wobei die zweite Ausgleichskupplung drehfest mit der Trägerstruktur verbunden ist.Advantageously, the second component group of the angle measuring device has a second compensating coupling, wherein the second compensating coupling is non-rotatably connected to the carrier structure.
Gemäß einer Weiterbildung der Erfindung weist die Winkelmesseinrichtung eine Maßverkörperung und ein Element zur Abtastung der Maßverkörperung auf. Die Maßverkörperung kann ringförmig ausgestaltet sein und ist dann geometrisch betrachtet ein Hohlzylinder mit umlaufenden Mantelseiten. Die Mantelseiten können eine geringe Höhe aufweisen, so dass die Maßverkörperung als Ringscheibe ausgestaltet ist mit ringförmigen parallel zueinander ausgerichteten Stirnflächen, die auch als Grund- oder Deckflächen bezeichnet werden können. Die Winkelskalierung oder Winkelcodierung kann auf einer der Stirnflächen aufgebracht sein.According to one embodiment of the invention, the angle measuring device has a material measure and an element for scanning the measuring graduation. The material measure can be designed annular and is then geometrically considered a hollow cylinder with circumferential sides of the shell. The shell sides may have a small height, so that the material measure is designed as an annular disc with annular parallel aligned end faces, which may also be referred to as the base or top surfaces. The angle scaling or angle coding can be applied to one of the end faces.
Gerade wenn die Maßverkörperung so ausgestaltet ist, dass die Mantelseiten eine vergleichsweise größere Höhe aufweist, also bei einer eher trommelförmigen Maßverkörperung, kann die Winkelskalierung auf der Mantelseite aufgebracht sein. Die Maßverkörperung kann aber auch als Maßband ausgestaltet sein, welches beispielsweise an der Mantelseite eines zylindrischen Körpers an dessen Außenseite oder an dessen Innenseite befestigt wird.Especially when the material measure is designed such that the shell sides has a comparatively greater height, ie in a rather drum-shaped material measure, the angle scaling can be applied to the shell side. However, the measuring standard can also be configured as a measuring tape, which is attached, for example, on the shell side of a cylindrical body on the outside or on the inside thereof.
Zudem kann die Maßverkörperung so ausgestaltet sein, dass diese nur über einen begrenzten Winkelbereich eine Skalierung aufweist, sich also nicht über 360° erstreckt, sondern nur ein Winkelsegment als Messbereich aufweist. Die winkelmäßige Erstreckung der Maßverkörperung kann auf den maximalen Messbereich beziehungsweise Schwenkwinkel abgestimmt sein.In addition, the material measure may be designed such that it has a scaling only over a limited angular range, ie does not extend over 360 °, but only has an angular segment as a measuring range. The angular extent of the material measure can be matched to the maximum measuring range or swivel angle.
Mit Vorteil ist das Element zur Abtastung der Maßverkörperung photosensitiv beziehungsweise lichtempfindlich ausgestaltet. Demgemäß beruht also eine derartige Abtastung auf einem optischen Prinzip.Advantageously, the element for scanning the material measure is designed to be photosensitive or photosensitive. Accordingly, such a sampling is based on an optical principle.
Alternativ kann die Abtastung auf einem induktiven oder magnetischen Prinzip beruhen.Alternatively, the sampling may be based on an inductive or magnetic principle.
Die Winkelmesseinrichtung kann insbesondere digitale Positionssignale und / oder Signale, die durch ein- oder mehrmaliges differenzieren der Positionssignale nach der Zeit erzeugt worden sind, liefern. Die Übertragung der betreffenden Signale kann rein digital und seriell erfolgen, so dass eine vergleichsweise einfache Verarbeitung der Signale möglich ist, z. B. zur Einbindung in eine hochdynamische Regelung.The angle measuring device can, in particular, provide digital position signals and / or signals which have been generated by single or multiple differentiation of the position signals with respect to time. The transmission of the relevant signals can be purely digital and serial, so that a comparatively simple processing of the signals is possible, for. B. for integration into a highly dynamic control.
Die Winkelmesseinrichtung weist mit Vorteil eine Maßverkörperung mit einer absoluten Codierung auf, so dass durch die Winkelmesseinrichtung die relative Winkellage zwischen der ersten und der zweiten Bauteilgruppe als eine absolute Größe messbar ist (im Gegensatz zu einer inkrementalen Messung). Auf diese Weise kann zu beliebigen Zeitpunkten die absolute Verformung des Rotorblatts gemessen werden. Dies ist insbesondere zur Überprüfung von Setzungsvorgängen in der Struktur des Rotorblatts vorteilhaft.The angle measuring device advantageously has a material measure with an absolute coding, so that the relative angular position between the first and the second component group can be measured as an absolute value by the angle measuring device (in contrast to an incremental measurement). In this way, the absolute deformation of the rotor blade can be measured at arbitrary times. This is particularly advantageous for checking settling processes in the structure of the rotor blade.
Mit Vorteil weist die Baueinheit mehrere Messvorrichtungen auf, die insbesondere entlang der Längsachse zueinander versetzt angeordnet sind beziehungsweise entlang der Längsachse aneinander gereiht sind.Advantageously, the structural unit has a plurality of measuring devices, which are arranged offset from one another, in particular along the longitudinal axis, or are lined up along the longitudinal axis.
Ein weiterer Aspekt der Erfindung betrifft ein Rotorblatt einer Windkraftanlage mit der Messvorrichtung zur Erfassung von Verformungen.Another aspect of the invention relates to a rotor blade of a wind turbine with the measuring device for detecting deformations.
Mit Vorteil ist der Stab so im Rotorblatt montiert, dass dieser in Längsrichtung des Rotorblatts orientiert ist.Advantageously, the rod is mounted in the rotor blade so that it is oriented in the longitudinal direction of the rotor blade.
In weiterer Ausgestaltung der Erfindung weist der Stab den gleichen Wärmeausdehnungskoeffizienten auf wie das Rotorblatt.In a further embodiment of the invention, the rod has the same thermal expansion coefficient as the rotor blade.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind den abhängigen Ansprüchen zu entnehmen.Further advantageous embodiments of the invention can be found in the dependent claims.
Weitere Merkmale und Vorteile der Erfindung werden bei der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der Figuren deutlich werden.Further features and advantages of the invention will become apparent in the following description of an embodiment with reference to the figures.
- Figur 1FIG. 1
- eine schematische Ansicht eines Rotorblatts mit einer Baueinheit zur Erfassung von Verformungen,a schematic view of a rotor blade with a structural unit for detecting deformations,
- Figur 2FIG. 2
- eine perspektivische Ansicht einer Baueinheit mit einer Trägerstruktur und einer Messvorrichtung zur Erfassung von Verformungen eines Rotorblatts,a perspective view of a structural unit with a support structure and a measuring device for detecting deformations of a rotor blade,
- Figur 3FIG. 3
- eine Schnittansicht einer Winkelmesseinrichtung als Bestandteil der Messvorrichtung.a sectional view of an angle measuring device as part of the measuring device.
In der
In der Trägerstruktur 1 ist eine Messvorrichtung 2 zur Erfassung von Verformungen des Rotorblatts 3 montiert, entsprechend der Ansicht gemäß der Figur 2, wobei dort zur besseren Veranschaulichung eine Wand der Trägerstruktur 1 in der Darstellung nicht vollständig gezeigt ist. Um eine Aussage über die Verformung des Rotorblatts 3 treffen zu können ist es vorteilhaft, wenn mehrere derartige Messvorrichtungen 2 zur Erfassung von Verformungen in der Trägerstruktur 1 montiert werden, wie in der
Die Messvorrichtung 2 umfasst eine erste Ausgleichskupplung 2.1, einen Stab 2.2 mit einer Längsachse A und eine Winkelmesseinrichtung 2.3, die auch als Drehgeber bezeichnet werden kann.The
Im vorgestellten Ausführungsbeispiel ist die erste Ausgleichskupplung 2.1 als Metallbalgkupplung ausgestaltet. Alternativ kann hier auch beispielsweise eine Membrankupplung eingesetzt werden. Die erste Ausgleichskupplung 2.1 gleicht jedenfalls Axialbewegungen und Fluchtungsabweichungen (Radial- und Winkelversatz) zwischen dem Stab 2.2 und der Trägerstruktur 1 aus und ist aber torsionssteif. Die erste Ausgleichskupplung 2.1 kann am ersten Flansch 1.1 der Trägerstruktur 1 starr befestigt werden.In the illustrated embodiment, the first compensating coupling 2.1 is configured as a metal bellows coupling. Alternatively, a diaphragm coupling can also be used here, for example. In any case, the first compensating coupling 2.1 compensates for axial movements and misalignment (radial and angular misalignment) between the bar 2.2 and the
Der Stab 2.2 ist wie das Rotorblatt 3 aus glasfaserverstärktem Kunststoff hergestellt und weist die Längsachse A auf, die in Richtung x parallel zur Längsachse des Rotorblatts 3 orientiert ist. Der Stab 2.2 weist weiterhin eine erste Verbindungsstelle auf, die mit der ersten Ausgleichskupplung 2.1 drehfest verbunden ist.The rod 2.2 is like the
Die Winkelmesseinrichtung 2.3 ist am zweiten Flansch 1.2 mit der Trägerstruktur 1 verbunden. Die gezeigte Winkelmesseinrichtung 2.3 umfasst gemäß der
An der Welle 2.311 ist ein Klemmelement 2.312 vorgesehen, mit dessen Hilfe der Stab 2.2 klemmend verdrehsicher mit Welle 2.311 verbunden ist, so dass bei einer Drehbewegung des Stabes 2.2 eine Schwenkbewegung der Welle 2.311 erzeugt werden kann. Das Klemmelement 2.312 kann der ersten Bauteilgruppe 2.31 zugeordnet werden. Der Stab 2.2 ist demnach an dessen zweiter Verbindungsstelle mit der Winkelmesseinrichtung 2.3 verbunden, insbesondere mit der ersten Bauteilgruppe 2.31 beziehungsweise der Welle 2.311 der Winkelmesseinrichtung 2.3.On the shaft 2.311, a clamping element 2.312 is provided, with the aid of which the rod 2.2 is connected to prevent jamming with shaft 2.311, so that during a rotational movement of the rod 2.2, a pivotal movement of the shaft 2.311 can be generated. The clamping element 2.312 can be assigned to the first component group 2.31. The rod 2.2 is therefore connected at its second connection point with the angle measuring device 2.3, in particular with the first component group 2.31 or the shaft 2.311 of the angle measuring device 2.3.
Die Welle 2.311 ist gemäß der
Um die Abtasteinrichtung 2.324 herum ist ein Gehäuse 2.321 montiert, so dass unter anderem die Lichtquelle 2.322, die Maßverkörperung 2.314 und die Abtasteinrichtung 2.324 gegenüber Umwelteinflüssen geschützt sind. Am Körper 2.323 ist eine zweite Ausgleichskupplung 2.325 befestigt. Im vorgestellten Ausführungsbeispiel ist die zweite Ausgleichskupplung 2.325 aus einem Blech gefertigt und insbesondere als einstückiges Stanz-Biegeteil hergestellt. Diese zweite Ausgleichskupplung 2.325 dient zur drehfesten Befestigung der Winkelmesseinrichtung 2.3 am zweiten Flansch 1.2 der Trägerstruktur 1. Die zweite Ausgleichskupplung 2.325 gleicht Axialbewegungen und Fluchtungsabweichungen (Radial- und Winkelversatz) zwischen der Winkelmesseinrichtung 2.3 und der Trägerstruktur 1 aus und ist aber torsionssteif.Around the scanning device 2.324 a housing 2.321 is mounted so that, among other things, the light source 2.322, the measuring scale 2.314 and the scanning device 2.324 are protected against environmental influences. On the body 2.323 a second compensating coupling 2.325 is attached. In the illustrated embodiment, the second compensating coupling 2.325 is made of a sheet metal and in particular produced as a one-piece stamped and bent part. This second compensating coupling 2.325 is used for non-rotatable attachment the second angle 2.3.2 compensates axial movements and misalignment (radial and angular misalignment) between the angle measuring device 2.3 and the
Über ein in den Figuren nicht gezeigtes Anschlusskabel, welches an einer Buchse angeschlossen wird, wird eine elektrische Verbindung zwischen der Winkelmesseinrichtung 2.3 und einer Folgeelektronik hergestellt, so dass elektrische Signale und elektrische Energie zwischen der Folgeelektronik und der Winkelmesseinrichtung 2.3 übertragen werden können.About a not shown in the figures connecting cable, which is connected to a socket, an electrical connection between the angle measuring device 2.3 and a subsequent electronics is made so that electrical signals and electrical energy between the sequential electronics and the angle measuring device 2.3 can be transmitted.
Durch die Winkelmesseinrichtung 2.3 kann also die relative Winkelstellung zwischen der ersten Bauteilgruppe 2.31 und der zweiten Bauteilgruppe 2.32 beziehungsweise zwischen der Welle 2.311 und dem Stab 2.2 bestimmt werden. Derartige Winkelmesseinrichtungen 2.3 werden auch häufig als Drehgeber bezeichnet.By means of the angle measuring device 2.3, the relative angular position between the first component group 2.31 and the second component group 2.32 or between the shaft 2.311 and the rod 2.2 can thus be determined. Such angle measuring devices 2.3 are also often referred to as rotary encoders.
Im Betrieb der Windkraftanlage werden die Rotorblätter 3 durch ihr Eigengewicht und durch aerodynamische Lasten verformt. Insbesondere können eingeprägte Lasten zu Torsionsbewegungen des Rotorblatts 3 um die Längsachse A führen. Durch diese Torsionsbewegungen wird die Trägerstruktur 1 verformt, was zur Folge hat, dass sich der Stab 2.2 relativ zum zweiten Flansch 1.2 verdreht. Diese Verdrehung um einen vergleichsweise geringen Winkelbetrag (im vorgestellten Ausführungsbeispiel ist die maximale Verdrehung etwa 120 Winkelminuten) wird von der Winkelmesseinrichtung 2.3 erfasst und es werden entsprechende Signale abgegeben. Somit führt also die ersten Bauteilgruppe 2.31 relativ zur zweiten Bauteilgruppe 2.32 Dreh- beziehungsweise Schwenkbewegungen nur in einem geringen Winkelbereich aus.During operation of the wind turbine, the
Wie in der
Die Messvorrichtung 2 zur Erfassung von Verformungen des Rotorblatts 3 ist naturgemäß in einer Windkraftanlage großen Temperaturschwankungen ausgesetzt. Dennoch können durch die oben dargelegte Messvorrichtung 2 zur Erfassung von Verformungen überaus hohe Messgenauigkeiten auch unter diesen widrigen Umgebungsbedingungen erreicht werden. Dies liegt zum einen daran, dass durch die Erfassung von Winkellagen die thermische Ausdehnung der Maßverkörperung 2.314 kaum eine Rolle spielt (die Abstände zwischen den Skalierungsstrichen und deren Breite variieren mit der Temperatur, jedoch nicht die Winkellage). Zum anderen sind der Stab 2.2 und das Rotorblatt 3 aus dem gleichen Material hergestellt, so dass beide dasselbe thermische Ausdehnungsverhalten aufweisen. Schließlich kann durch das topfförmige elektrisch leitende Gehäuse 2.321 ein optimaler Schutz, insbesondere für die Abtasteinrichtung 2.324 und zugehöriger Elektronik, vor Überspannungen z. B. bei Gewittern gewährleistet werden.The measuring
Die von der Winkelmesseinrichtung 2.3 abgebbaren Signale sind vorteilhafterweise voll digital, so dass die oben genannte Folgeelektronik die Signale sämtlicher Messvorrichtungen 2 zur Erfassung von Verformungen der Rotorblätter ohne weitere Digitalisierung verarbeiten kann. Dies gewährleistet einerseits eine gegenüber äußeren Störungen sichere Signalübertragung, zum anderen können die Signale vergleichsweise einfach verarbeitet werden, so dass die gemessenen Verformungen in einem Regelkreis, z. B., zur (separaten) Regelung des Pitch-Winkels für jedes Rotorblatt 3 verwendet werden können.The signals which can be emitted by the angle measuring device 2.3 are advantageously fully digital, so that the above-mentioned sequential electronics can process the signals of all measuring
Claims (10)
die erste Ausgleichskupplung (2.1) drehfest mit der Trägerstruktur (1) verbunden ist,
der Stab (2.2) drehfest mit der erste Ausgleichskupplung (2.1) verbunden ist,
die erste Bauteilgruppe (2.31) drehfest mit dem Stab (2.2) verbunden ist und
die zweite Bauteilgruppe (2.32) drehfest mit der Trägerstruktur (1) verbunden ist,
so dass eine um die Längsachse (A) durch mechanische Belastung hervorgerufene Torsion der Trägerstruktur (1) bestimmbar ist durch Messung der relativen Winkellage der beiden Bauteilgruppen (2.31, 2.32) zueinander.Assembly comprising a support structure (1) and a measuring device (2), the measuring device (2)
the first compensating coupling (2.1) is non-rotatably connected to the carrier structure (1),
the rod (2.2) is non-rotatably connected to the first compensating coupling (2.1),
the first group of components (2.31) is non-rotatably connected to the rod (2.2) and
the second group of components (2.32) is non-rotatably connected to the carrier structure (1),
such that a torsion of the carrier structure (1) caused by mechanical load about the longitudinal axis (A) can be determined by measuring the relative angular position of the two component groups (2.31, 2.32) relative to one another.
Applications Claiming Priority (1)
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DE102018204349.3A DE102018204349A1 (en) | 2018-03-21 | 2018-03-21 | Assembly for detecting deformations and rotor blade with such a structural unit |
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EP3543643B1 EP3543643B1 (en) | 2020-05-13 |
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US (1) | US11143166B2 (en) |
EP (1) | EP3543643B1 (en) |
CN (1) | CN110296054B (en) |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4340030C1 (en) * | 1993-11-24 | 1995-04-06 | Ief Werner Gmbh | Compensating coupling for coupling two shafts |
DE10003738A1 (en) * | 2000-01-28 | 2001-08-09 | Bosch Gmbh Robert | Torque detection device for e.g. shaft control of vehicle has optical scanner which evaluates relative rotation of codings on concentric encoder disks so that torque on connecting bodies can be determined |
US7059822B2 (en) | 2004-06-30 | 2006-06-13 | General Electrick Company | Methods and apparatus for measuring wind turbine blade deflection |
DE102013223780A1 (en) * | 2013-11-21 | 2015-05-21 | Dr. Johannes Heidenhain Gmbh | Device for detecting deformations of a rotor blade of a wind turbine and corresponding rotor blade |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2339173B1 (en) * | 2009-12-22 | 2015-04-01 | Siemens Aktiengesellschaft | Blade deflection measurement with magnetostrictive sensor |
DE102012000716B3 (en) * | 2012-01-14 | 2012-12-27 | Ssb Wind Systems Gmbh & Co. Kg | Wind turbine for use in wind energy plant for generating electric energy from wind force, has holder detachably fastened to leaf bearing flanges in area of connection of hub with rotor blades such that turbine is retrofitted with wind gauge |
DE102012002203A1 (en) * | 2012-02-07 | 2013-08-08 | Imo Holding Gmbh | Rolling bearing arrangement for the storage of parts of a wind turbine, as well as wind turbine with a thus designed blade bearing |
-
2018
- 2018-03-21 DE DE102018204349.3A patent/DE102018204349A1/en not_active Withdrawn
-
2019
- 2019-01-21 EP EP19152693.8A patent/EP3543643B1/en active Active
- 2019-01-21 ES ES19152693T patent/ES2806006T3/en active Active
- 2019-01-21 DK DK19152693.8T patent/DK3543643T3/en active
- 2019-03-20 US US16/358,736 patent/US11143166B2/en active Active
- 2019-03-21 CN CN201910216882.8A patent/CN110296054B/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4340030C1 (en) * | 1993-11-24 | 1995-04-06 | Ief Werner Gmbh | Compensating coupling for coupling two shafts |
DE10003738A1 (en) * | 2000-01-28 | 2001-08-09 | Bosch Gmbh Robert | Torque detection device for e.g. shaft control of vehicle has optical scanner which evaluates relative rotation of codings on concentric encoder disks so that torque on connecting bodies can be determined |
US7059822B2 (en) | 2004-06-30 | 2006-06-13 | General Electrick Company | Methods and apparatus for measuring wind turbine blade deflection |
DE102013223780A1 (en) * | 2013-11-21 | 2015-05-21 | Dr. Johannes Heidenhain Gmbh | Device for detecting deformations of a rotor blade of a wind turbine and corresponding rotor blade |
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ES2806006T3 (en) | 2021-02-16 |
EP3543643B1 (en) | 2020-05-13 |
CN110296054B (en) | 2023-12-01 |
US20190293054A1 (en) | 2019-09-26 |
CN110296054A (en) | 2019-10-01 |
DE102018204349A1 (en) | 2019-09-26 |
DK3543643T3 (en) | 2020-08-03 |
US11143166B2 (en) | 2021-10-12 |
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